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SAE-AISI 9255 Steel vs. Titanium 6-7

SAE-AISI 9255 steel belongs to the iron alloys classification, while titanium 6-7 belongs to the titanium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is titanium 6-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
120
Elongation at Break, % 21
11
Fatigue Strength, MPa 270
530
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
45
Shear Strength, MPa 430
610
Tensile Strength: Ultimate (UTS), MPa 680
1020
Tensile Strength: Yield (Proof), MPa 390
900

Thermal Properties

Latent Heat of Fusion, J/g 280
410
Maximum Temperature: Mechanical, °C 400
300
Melting Completion (Liquidus), °C 1430
1700
Melting Onset (Solidus), °C 1390
1650
Specific Heat Capacity, J/kg-K 480
520
Thermal Expansion, µm/m-K 13
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
75
Density, g/cm3 7.7
5.1
Embodied Carbon, kg CO2/kg material 1.5
34
Embodied Energy, MJ/kg 20
540
Embodied Water, L/kg 46
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 400
3460
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
32
Strength to Weight: Axial, points 24
56
Strength to Weight: Bending, points 22
44
Thermal Shock Resistance, points 21
66

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
Carbon (C), % 0.51 to 0.59
0 to 0.080
Hydrogen (H), % 0
0 to 0.0090
Iron (Fe), % 96.2 to 97
0 to 0.25
Manganese (Mn), % 0.7 to 1.0
0
Molybdenum (Mo), % 0
6.5 to 7.5
Niobium (Nb), % 0
6.5 to 7.5
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 1.8 to 2.2
0
Sulfur (S), % 0 to 0.040
0
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
84.9 to 88